Ridge shaped element

Abstract

A cutting element includes a substrate and an ultrahard layer on an upper surface of the substrate, a top surface of the ultrahard layer having a ridge extending along a major dimension of the top surface from an edge of the top surface, where the ridge has a peak with at least two different roof radii of curvature, and at least two sidewalls sloping in opposite directions from the peak of the ridge at a roof angle, where a first roof angle of the ridge proximate the edge is smaller than a second roof angle in a central portion of the ridge around a longitudinal axis of the cutting element.

What is claimed is: 
     
       1. A cutting element comprising:
 a substrate; and 
 an ultrahard layer on an upper surface of the substrate, a top surface of the ultrahard layer comprising:
 a ridge extending along a major dimension of the top surface from an edge of the top surface, the ridge having a peak with at least two different roof radii of curvature; and 
 at least two sidewalls sloping in opposite directions from the peak of the ridge at a roof angle, wherein a first roof angle of the ridge proximate the edge is smaller than a second roof angle in a central portion of the ridge around a longitudinal axis of the cutting element. 
 
 
     
     
       2. The cutting element of  claim 1 , wherein a roof ridge angle defined between a line tangent to the peak of the ridge proximate the edge and a plane perpendicular to the longitudinal axis ranges from greater than zero to 10 degrees. 
     
     
       3. The cutting element of  claim 1 , wherein the sidewalls sloping from the ridge at the first roof angle are recessed from the sidewalls sloping from the ridge at the second roof angle. 
     
     
       4. The cutting element of  claim 1 , further comprising a chamfer formed around the edge of the top surface. 
     
     
       5. The cutting element of  claim 1 , wherein the ridge has at least one concave recess formed along the peak of the ridge. 
     
     
       6. The cutting element of  claim 1 , wherein an interface formed between a bottom surface of the ultrahard layer and the upper surface of the substrate is nonplanar, the bottom surface comprising a protrusion formed opposite the ridge and proximate the edge and the upper surface of the substrate comprising a recessed portion having a corresponding shape to the protrusion. 
     
     
       7. The cutting element of  claim 1 , wherein the first roof angle ranges between 110 degrees and 130 degrees, and the second roof angle ranges between 135 degrees and 165 degrees. 
     
     
       8. A cutting element comprising:
 a top surface having a ridge extending from an edge of the top surface along a major dimension of the top surface; and 
 a peak of the ridge having a width measured between opposite points of transition from the peak to a sidewall, wherein the width of the peak in a central portion of the ridge around a longitudinal axis of the cutting element is greater than the width of the peak at the edge portion of the ridge, the edge portion extending a length of the ridge from the edge to the central portion, 
 wherein the peak has a roof radius of curvature along an edge portion of the ridge less than 0.1 inches. 
 
     
     
       9. The cutting element of  claim 8 , wherein the peak in the central portion of the ridge has a polygonal shape. 
     
     
       10. The cutting element of  claim 8 , wherein the peak in the central portion of the ridge has an oval shape. 
     
     
       11. The cutting element of  claim 8 , wherein the width of the peak in the central portion of the ridge extends greater than 50 percent of the major dimension. 
     
     
       12. The cutting element of  claim 8 , wherein the width of the peak in the central portion of the ridge extends to opposite sides of the edge of the top surface. 
     
     
       13. The cutting element of  claim 8 , wherein the sidewalls on opposite sides of the peak in the edge portion extend from the peak at a roof angle less than 135 degrees. 
     
     
       14. The cutting element of  claim 8 , wherein the peak of the edge portion extends from the central portion at a roof ridge angle defined between a line tangent to the peak of the ridge and a plane perpendicular to the longitudinal axis ranges from greater than zero to 10 degrees. 
     
     
       15. A cutting element, comprising:
 a substrate; and 
 an ultrahard layer on an upper surface of the substrate, a top surface of the ultrahard layer comprising:
 a ridge extending across a major dimension of the top surface between opposite sides of an edge around the top surface, wherein the ridge comprises:
 a peak, wherein at least a portion of the peak is formed of a planar surface; and 
 a width measured between opposite sides of the peak; 
 wherein the width of the ridge in an edge portion of the ridge is smaller than the width of the ridge in a central portion of the top surface; and 
 
 sidewalls extending from opposite sides of the ridge to at least one recessed edge portion of the edge. 
 
 
     
     
       16. The cutting element of  claim 15 , wherein the portion of the peak having a planar surface forms a geometric surface extending between opposite sides of the edge. 
     
     
       17. The cutting element of  claim 15 , wherein the peak in the edge portion of the ridge has a roof radius of curvature that is less than 0.1 inches. 
     
     
       18. The cutting element of  claim 15 , wherein the sidewalls have an undulating geometry comprising at least one scooped region proximate a cutting edge portion of the edge and at least one raised region extending between the central portion and a raised edge portion of the edge. 
     
     
       19. The cutting element of  claim 15 , wherein the top surface further comprises a transition region extending between the peak and the sidewalls.